Physics – Condensed Matter – Superconductivity
Scientific paper
2001-10-11
Physics
Condensed Matter
Superconductivity
14 pages, 7 figures, 1 table; Submitted to Physica C; presentation at ISS-2001, Kobe Japan
Scientific paper
10.1016/S0921-4534(02)01552-6
Monofilamentary MgB2-wires with a mechanical tough Nb/Cu/steel or Fe/steel sheath were prepared and characterized. The steel content was varied to investigate the reinforcement effect and the consequences for the superconducting properties of the wires, which were heat treated to achieve dense and homogeneous filaments. The use of Nb as first sheath layer, having a smaller thermal expansion coefficient than MgB2, requires the application of higher amounts of steel to achieve compressive pre-stress on the filament in comparison to Fe as first wall material. With raised steel content in the sheath the critical transport currents show field dependent significant critical current and irreversibility field degradations. First Ic vs. axial stress and strain experiments confirmed this observation of pre-stress induced degradations. Consequences for improved wires and for future applications will be discussed.
Goldacker Wilfried
Schlachter Sonja I.
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